TF_DecryptorBase Class Reference

#include <pubkey.h>

Inheritance diagram for TF_DecryptorBase:

List of all members.

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Detailed Description

_

Definition at line 166 of file pubkey.h.

Public Member Functions
DecodingResult	Decrypt (RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const
	decrypt a byte string, and return the length of plaintext
bool	ParameterSupported (const char *name) const
	this object supports the use of the parameter with the given name
size_t	FixedMaxPlaintextLength () const
	return maximum plaintext length given the fixed ciphertext length, if one exists, otherwise return 0
size_t	FixedCiphertextLength () const
	return fixed ciphertext length, if one exists, otherwise return 0
size_t	MaxPlaintextLength (size_t ciphertextLength) const
	maximum length of plaintext for a given ciphertext length
size_t	CiphertextLength (size_t plaintextLength) const
	calculate length of ciphertext given length of plaintext
virtual BufferedTransformation *	CreateDecryptionFilter (RandomNumberGenerator &rng, BufferedTransformation *attachment=NULL, const NameValuePairs &parameters=g_nullNameValuePairs) const
	create a new decryption filter
DecodingResult	FixedLengthDecrypt (RandomNumberGenerator &rng, const byte *ciphertext, byte *plaintext, const NameValuePairs &parameters=g_nullNameValuePairs) const
	decrypt a fixed size ciphertext
CryptoMaterial &	AccessMaterial ()
	returns a reference to the crypto material used by this object
const CryptoMaterial &	GetMaterial () const
	returns a const reference to the crypto material used by this object
virtual PrivateKey &	AccessPrivateKey ()=0
virtual const PrivateKey &	GetPrivateKey () const
void	BERDecode (BufferedTransformation &bt)
	for backwards compatibility, calls AccessMaterial().Load(bt)
void	DEREncode (BufferedTransformation &bt) const
	for backwards compatibility, calls GetMaterial().Save(bt)
virtual std::string	AlgorithmName () const
	returns name of this algorithm, not universally implemented yet
virtual Clonable *	Clone () const
	this is not implemented by most classes yet
Protected Types
typedef TrapdoorFunctionInverse	TrapdoorFunctionInterface
typedef PK_EncryptionMessageEncodingMethod	MessageEncodingInterface
Protected Member Functions
size_t	PaddedBlockByteLength () const
size_t	PaddedBlockBitLength () const
virtual const TrapdoorFunctionBounds &	GetTrapdoorFunctionBounds () const=0
virtual const TrapdoorFunctionInterface &	GetTrapdoorFunctionInterface () const=0
virtual const MessageEncodingInterface &	GetMessageEncodingInterface () const=0

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Member Function Documentation

DecodingResult TF_DecryptorBase::Decrypt	(	RandomNumberGenerator &	rng,
		const byte *	ciphertext,
		size_t	ciphertextLength,
		byte *	plaintext,
		const NameValuePairs &	parameters = g_nullNameValuePairs
	)			const [virtual]

decrypt a byte string, and return the length of plaintext

Precondition:

size of plaintext == MaxPlaintextLength(ciphertextLength) bytes.

Returns:

the actual length of the plaintext, indication that decryption failed.

Implements PK_Decryptor.

Definition at line 135 of file pubkey.cpp.

References Integer::ByteCount(), TrapdoorFunctionInverse::CalculateInverse(), Integer::Encode(), TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >::FixedCiphertextLength(), TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >::PaddedBlockBitLength(), TF_CryptoSystemBase< PK_Decryptor, TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >::PaddedBlockByteLength(), SecBlock< T, A >::size(), PK_EncryptionMessageEncodingMethod::Unpad(), and Integer::Zero().

bool TF_CryptoSystemBase< PK_Decryptor , TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >::ParameterSupported

(

const char *

name

)

const [inline, virtual, inherited]

Implements PK_CryptoSystem.

Definition at line 156 of file pubkey.h.

size_t TF_CryptoSystemBase< PK_Decryptor , TF_Base< TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod > >::FixedCiphertextLength

(

)

const [inline, virtual, inherited]

Implements PK_FixedLengthCryptoSystemImpl< PK_Decryptor >.

Definition at line 158 of file pubkey.h.

Referenced by Decrypt().

size_t PK_FixedLengthCryptoSystemImpl< PK_Decryptor >::MaxPlaintextLength

(

size_t

ciphertextLength

)

const [inline, virtual, inherited]

Implements PK_CryptoSystem.

Definition at line 142 of file pubkey.h.

size_t PK_FixedLengthCryptoSystemImpl< PK_Decryptor >::CiphertextLength

(

size_t

plaintextLength

)

const [inline, virtual, inherited]

Implements PK_CryptoSystem.

Definition at line 144 of file pubkey.h.

BufferedTransformation * PK_Decryptor::CreateDecryptionFilter	(	RandomNumberGenerator &	rng,
		BufferedTransformation *	attachment = NULL,
		const NameValuePairs &	parameters = g_nullNameValuePairs
	)			const [virtual, inherited]

create a new decryption filter

Note:

caller is responsible for deleting the returned pointer

Definition at line 618 of file cryptlib.cpp.

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The documentation for this class was generated from the following files:

• pubkey.h
• pubkey.cpp

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